. Contributions from the Laboratory of Plant Genetics. Studies of Teratological Phenomena. 61 normal flower being 5-parted, the abnormal having approximately 10, 15 and 20 lobes. Such a series is no present in JSicotiana, irregularity in number being characteristic of all increases in the number of parts to its whorls. Alterations in flowers expressed in a linear manner or as a single plane are usually confined to the gynoecium. The other whorls generally retain their normal shape, unless rendered impossible through changes in the form of the gynoecium. Hypertrophy and atrophy are commonly pre
. Contributions from the Laboratory of Plant Genetics. Studies of Teratological Phenomena. 61 normal flower being 5-parted, the abnormal having approximately 10, 15 and 20 lobes. Such a series is no present in JSicotiana, irregularity in number being characteristic of all increases in the number of parts to its whorls. Alterations in flowers expressed in a linear manner or as a single plane are usually confined to the gynoecium. The other whorls generally retain their normal shape, unless rendered impossible through changes in the form of the gynoecium. Hypertrophy and atrophy are commonly present. The former expresses itself as an increase in size relations, the latter as abortions. Fig. 4. Fasciated pineapple fruit with 71 crowns. (After M. T. Cook.) of organs. Atrophy associated with fasciation frequently takes the form of abortion of gynoecial and androecial (contabescence of anthers) structures, producing either partial or complete structural and functional sterility. Many minor alterations in the character of each whorl may be associated with fasciation. Petalody of sepala (calycanthemy) and stamens, pistillody of stamens, adhesion and cohesion of the different floral organs, synanthy, syncarpy, and dialysis are somewhat common attendant phenomena. One may rightly infer from the preceding account that in the floral organs, the expression of this anomalous character very often reaches its maximum, and produces its greatest Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bussey Institution. Boston : [s. n. ]
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